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In-Reply-To: <1280850203-5532-1-git-send-email-segooon@gmail.com>
References: <1280850203-5532-1-git-send-email-segooon@gmail.com>
Date: Tue, 3 Aug 2010 18:14:11 +0200
Message-ID: <AANLkTinzvwP74oNaS+mWRnostnGrZZ-iY2SsjMzo=CW4@mail.gmail.com>
Subject: Re: [PATCH 06/11] rt2x00: do not use PCI resources before 
	pci_enable_device()
From: Gertjan van Wingerde <gwingerde@gmail.com>
To: Kulikov Vasiliy <segooon@gmail.com>
Cc: kernel-janitors@vger.kernel.org, Ivo van Doorn <IvDoorn@gmail.com>,
        "John W. Linville" <linville@tuxdriver.com>,
        Helmut Schaa <helmut.schaa@googlemail.com>,
        Alban Browaeys <prahal@yahoo.com>, linux-wireless@vger.kernel.org,
        users@rt2x00.serialmonkey.com, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
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On Tue, Aug 3, 2010 at 5:43 PM, Kulikov Vasiliy <segooon@gmail.com> wrote:
> IRQ and resource[] may not have correct values until
> after PCI hotplug setup occurs at pci_enable_device() time.
>
> The semantic match that finds this problem is as follows:
>
> // <smpl>
> @@
> identifier x;
> identifier request ~= "pci_request.*|pci_resource.*";
> @@
>
> (
> * x->irq
> |
> * x->resource
> |
> * request(x, ...)
> )
> ?...
> *pci_enable_device(x)
> // </smpl>
>
> Signed-off-by: Kulikov Vasiliy <segooon@gmail.com>

Good catch.

Acked-by: Gertjan van Wingerde <gwingerde@gmail.com>

> ---
> ?drivers/net/wireless/rt2x00/rt2x00pci.c | ? 21 ++++++++++-----------
> ?1 files changed, 10 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/net/wireless/rt2x00/rt2x00pci.c b/drivers/net/wireless/rt2x00/rt2x00pci.c
> index 19b262e..63c2cc4 100644
> --- a/drivers/net/wireless/rt2x00/rt2x00pci.c
> +++ b/drivers/net/wireless/rt2x00/rt2x00pci.c
> @@ -240,16 +240,16 @@ int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
> ? ? ? ?struct rt2x00_dev *rt2x00dev;
> ? ? ? ?int retval;
>
> - ? ? ? retval = pci_request_regions(pci_dev, pci_name(pci_dev));
> + ? ? ? retval = pci_enable_device(pci_dev);
> ? ? ? ?if (retval) {
> - ? ? ? ? ? ? ? ERROR_PROBE("PCI request regions failed.\n");
> + ? ? ? ? ? ? ? ERROR_PROBE("Enable device failed.\n");
> ? ? ? ? ? ? ? ?return retval;
> ? ? ? ?}
>
> - ? ? ? retval = pci_enable_device(pci_dev);
> + ? ? ? retval = pci_request_regions(pci_dev, pci_name(pci_dev));
> ? ? ? ?if (retval) {
> - ? ? ? ? ? ? ? ERROR_PROBE("Enable device failed.\n");
> - ? ? ? ? ? ? ? goto exit_release_regions;
> + ? ? ? ? ? ? ? ERROR_PROBE("PCI request regions failed.\n");
> + ? ? ? ? ? ? ? goto exit_disable_device;
> ? ? ? ?}
>
> ? ? ? ?pci_set_master(pci_dev);
> @@ -260,14 +260,14 @@ int rt2x00pci_probe(struct pci_dev *pci_dev, const struct pci_device_id *id)
> ? ? ? ?if (dma_set_mask(&pci_dev->dev, DMA_BIT_MASK(32))) {
> ? ? ? ? ? ? ? ?ERROR_PROBE("PCI DMA not supported.\n");
> ? ? ? ? ? ? ? ?retval = -EIO;
> - ? ? ? ? ? ? ? goto exit_disable_device;
> + ? ? ? ? ? ? ? goto exit_release_regions;
> ? ? ? ?}
>
> ? ? ? ?hw = ieee80211_alloc_hw(sizeof(struct rt2x00_dev), ops->hw);
> ? ? ? ?if (!hw) {
> ? ? ? ? ? ? ? ?ERROR_PROBE("Failed to allocate hardware.\n");
> ? ? ? ? ? ? ? ?retval = -ENOMEM;
> - ? ? ? ? ? ? ? goto exit_disable_device;
> + ? ? ? ? ? ? ? goto exit_release_regions;
> ? ? ? ?}
>
> ? ? ? ?pci_set_drvdata(pci_dev, hw);
> @@ -300,13 +300,12 @@ exit_free_reg:
> ?exit_free_device:
> ? ? ? ?ieee80211_free_hw(hw);
>
> -exit_disable_device:
> - ? ? ? if (retval != -EBUSY)
> - ? ? ? ? ? ? ? pci_disable_device(pci_dev);
> -
> ?exit_release_regions:
> ? ? ? ?pci_release_regions(pci_dev);
>
> +exit_disable_device:
> + ? ? ? pci_disable_device(pci_dev);
> +
> ? ? ? ?pci_set_drvdata(pci_dev, NULL);
>
> ? ? ? ?return retval;
> --
> 1.7.0.4
>
>
--
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